JPS6186877A - Rotable data terminal equipment - Google Patents

Abstract

PURPOSE:To avoid a malfunction or the breakdown of the stored data, programs, etc. owing to a fact that the power supply voltage is too low, by inhibiting the start of a device when the power supply voltage has a drop. CONSTITUTION:When the power supply voltage has a drop, a power supply voltage detecting means 5 delivers the detection signals (high levels) to a control part 6 and a start signal control means 7. The part 6 decides the drop of the power supply voltage and informs this to an operator and at the same time discontinues operations. A start signal output means 8 delivers a start signal (low level) to a start signal control means 7 as long as an operation start input is supplied from the operator when the power supply voltage has a drop or a power supply having a reduced voltage level is connected. In this case, the means 7 delivers no start signal (low level) to the pat 6 since the detection signal is supplied from the means 5.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a portable data terminal device that uses a battery as a power source and has storage means for storing data such as J-grams and input data.

Structure of a conventional example and its problems FIG. 1 shows a part of a conventional portable data terminal device. The configuration of the conventional example will be explained below with reference to FIG. In FIG. 1, 1 is a power supply type L [detection means;
This detection means 1 is connected to a control section 2 that controls the entire data terminal device.

3 is a start signal output means, and this start signal output means 3 is connected to the control section 2. Reference numeral 4 denotes a storage section, which stores accumulated data input by the operator and programs for operating the terminal device, and is connected to the control section 2.

Next, the operation of the above conventional example will be explained. In FIG. 1, when the power supply voltage decreases, a detection signal is output from the power supply voltage detection means 1 to the control section 2, and the control section 1 determines that the power supply voltage has decreased and notifies the operator of this fact. The control unit 2 still stops operating. When the operator inputs an input to start the operation, a start signal is output from the start signal output means 3 to the control section 2, and the control section starts operating.

However, in the above conventional example, when the operator inputs an input to start operation when the power supply voltage drops or a power supply with a reduced voltage is connected, the control unit 2, a start signal is output from the start signal output means 1, and the control section 2 starts operating. At this time, since the power supply voltage is not a voltage that guarantees normal operation, the data or programs read from the storage unit 4 may be mistakenly read, or the stored data or programs may be stored due to incorrect data being written. It had the disadvantage of destroying the etc.

Purpose of the Invention The present invention eliminates the drawbacks of the above-mentioned conventional examples, and is intended to prevent the device from starting up when the power supply voltage drops or when a power supply with a reduced voltage is connected. The purpose of this is to prevent stored data, programs, etc. from malfunctioning due to too low power supply voltage, and to protect stored data, programs, etc. from being destroyed.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a detection means for detecting whether the power supply voltage has reached a reference voltage that allows normal operation, and a detection signal outputted from the detection means to detect a data terminal device. The whole thing is 1jJ? A start signal control means outputs a start signal to the control unit that starts operation when the reference voltage is higher than the reference voltage, and prohibits the output of this signal when the reference voltage is not reached, leaving the control unit in a stopped state. This prevents the device from starting up when the power supply voltage is too low or when the power supply voltage has dropped. It has a protective effect.

DESCRIPTION OF EMBODIMENTS The structure of an embodiment of the present invention will be described below with reference to FIG. Reference numeral 5 denotes power supply voltage detection means, which is connected to the control section 6 and the activation signal control means 7.

8 is a start signal output means, and this start signal output means 8
is connected to the start signal control means 7, and the start signal: tllJ
The control means 7 is connected to the control section 6. 9 is a storage section, and this storage section 9 is connected to the control section 6.

Next, the operation of the above embodiment will be explained. In FIG. 2, when the power supply voltage decreases, a detection signal (high level) is output from the power supply voltage detection means 5 to the control section 6 and the start signal control means. When the control unit 6 determines that the power supply voltage has decreased and the operator inputs this information, the control unit 6 outputs a start signal (L) from the start signal output means 8 to the start signal control means 7.
OW level). At this time, the start signal control means 7
Since the detection signal from the power supply voltage detection means 5 is input, the activation signal (Low level) is not outputted to the control section 6. When the power supply voltage is still normal (reaching the reference voltage), a start signal is sent from the start signal output means 8 to the control unit 6 through the start signal control means 7 when an operation start input is input from the operator. Output. FIG. 3 shows the control of this activation signal.

Figure 3 (A) shows the control of the start signal when the power supply voltage drops or when a power supply with a reduced voltage is connected.
Figure 3 CB) shows the control of the start signal when the power supply voltage is normal.

In this embodiment, the start signal is controlled depending on whether the power supply voltage is sufficient for normal operation, so when the power supply voltage drops or a power supply whose voltage has dropped is connected, the operator can There is an advantage in that data, programs, etc. that do not operate even after inputting a start input and are stored can be protected.

Effects of the Invention The present invention has the above-mentioned configuration and provides the following effects.

The start signal is controlled depending on whether the power supply voltage is sufficient for normal operation, so it will not operate even if the operator inputs an operation start input when the power supply voltage drops or a power supply whose voltage has dropped is connected. Therefore, it is possible to protect stored data, programs, etc. from being destroyed due to malfunction.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of a conventional portable data terminal device l;
The figure is a configuration diagram of a portable data terminal device according to an embodiment of the present invention, and FIGS. 3 (5) and (B) show the activation signal when the power supply voltage drops below the reference voltage and when it is normal, respectively. It is a figure which shows control. 5...Power supply voltage detection means, 6...Control unit, 7...Start signal side, wholesale means, meter...Start signal output means, 9...
・Memory section. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 3 (A)L ---
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B)

Claims (1)

[Claims] A power supply voltage detection means detects whether the power supply voltage has reached a reference voltage that allows normal operation, and a detection signal output from this detection means causes the control unit that controls the entire data terminal device to operate if the reference voltage is higher than the reference voltage. It has a start signal control means that outputs a start signal (reset) to start the device and prohibits the output of the start signal if the reference voltage is not reached. A portable data terminal device configured to prevent stored data, programs, etc. from being destroyed due to malfunction by preventing activation.